// [Start grid_template_columns]
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Demo</title>
</head>
<style>
  .container {
    display: grid;
    gap: 20px;
    grid-template-columns: 100px 100px 100px;
    grid-template-rows: 100px 100px;
  }
  .container .grid-item {
    background-color: #f6fdf5;
    text-align: center;
    line-height: 100px;
  }
</style>
<body>
<div class="container">
  <div class="grid-item">1</div>
  <div class="grid-item">2</div>
  <div class="grid-item">3</div>
  <div class="grid-item">4</div>
  <div class="grid-item">5</div>
  <div class="grid-item">6</div>
</div>
</body>
</html>
// [End grid_template_columns]